Fighting intensified in the streets of Severodonetsk in recent days, as Russian troops push to take control of more of the strategic city. Elsewhere in Ukraine, Russian forces are targeting key infrastructure — particularly bride links that have been critical to ensuring the flow of some Ukrainian exports after Russian forces blockaded the country's Black Sea ports.

US President Joe Biden said that Washington will send Ukraine "advanced rocket systems" to hit "key targets."

The advanced rocket systems are part of a $700 million (€653 million) weapons package expected to be unveiled on Wednesday.

Officials said that the package will also include ammunition, counterfire radars, a number of air surveillance radars, additional Javelin anti-tank missiles and anti-armor weapons.